Method of producing phosphorus chloride



' sulphide. residue oi calcium instep PATENT? orrice,

{EILA'UBE i3. EITHER, Gil BEHKELEY, 'OALH'OBNIA.

F EQDUCING PHOSPHORUS CHLORIDE.

lilo Application filed Zluiy' 25,

' phosphorus sulphide oy reacting phosphate rock modding to the 101- reaction:

1e diiliculty with which the phosphorus L tonide is freed from the phospnatc ro l; or the sodium chloride or sodium i has also been found that a solid oxide and sodium oxide d in the above reactions and that .16 accumulates to an extent which makes necessary to frequently shut down the op ation and precludes a continuous operation of the process. It has also been found that in the shove operations that some diuni oxide formed becomes volati zed and passes over with the phosphorus chloride sulphide vapors, thus necessitutsubsequent separation to purify the chloride or sulphide to removeis prod'u tins piiospho sodn oxide, ha u sccvered 1i sillcu be emed in suostsntiel quantity the aforesr n operations that the difficulties above me tioned may be eliminated or substantialemployment of the silica n ewes to produce a fusible slag"; eliminminp the solid residue in the reaction. chamber and permittingthe epochtion to proceed continuously. The presence oi silica assists in freeing the phosphorus pentoride 1 13 from the phosphate reel: by forming an intermediate compound luced temperature in which compound i pentonide loosely held and i it is readily liberated by addihenn The reaction illustrating the of this intermediate compound is:

on illustrating the liberation of X tionci iorznuti 1925. semi mi. mm.

the phosphate pentoxide from the 'diate compound is:

3O21G3SiO -P O 3Ce() ESiO P 0 The pressence of the silica in the operation further serves to prevent a portion of the so drum oxide becoming voletilized and assmg over with the phosphorus chlori e or sulphide inasmuch. as the silicereocts with the calcium and sodium oxides to form calclum sodium silicate slog. This reaction is:

It will be apparent that the presence of the silica in the operation, acting in the various as one product from the reaction chamber and the remaining products, including silicatcs of sodlum and calcium, are 111 the form of a fusible slag which may be run oli' from the reaction chamber.

While in the specific example given in this speclfication sodium chloride or sulphide alone have been designated it is to be under stood that any of the alkali-motel or alkaliearth nietul chlorides or sulphides may be employed in the production of the phosphorus chloride or sulphide.

The invention is capable of being put to use under widely varying circumstances and conditions, and I do not intend to limit the some to the above disclosure except as may be required by the following claims.

I claim: 4

1 A process of producing volatile phosphorus compounds from phosphate rock which comprises causing phosphaterock to react with a halogen salt of an alkali-metal in the presence of silica.

2. A process of producing phosphorus chloride from phosphate rock which comprises causing phosphate rock to react with an alkali-metal chloride in the presence of silica.

mmwa chiaride from. phosphafie rack which c0mprises causmg phQSphate rock in react Wm an Mkahaneizfl. enlonde in the presence of: sxllw at & tempei'atura of subswmmfly 1100" 4. A prowess, cf prmlucing phnsphmrus chlm'ide fi'om phosphate rock in amcoriance with ."bhe fallow mg reasinn: CzEAPO 8$i0 10N&@1-

a g'mwzs @f prroflugsing phosphozus hinria from phosphafie rock by causing. phosphate rack to react with a chiozrie of an zomfiimg metal, the step 01? emplgying 31h siiisate 0 pmduca subsmmially pure valatfle phesp'homs; ailim'ivie.

at Sam'Fmnciscn, Calii, this 10th day 0 July 1925" Y @LAQ'DE Gr. MENER.

a in the macmon to form a non-volatile 15, 

